Button emitting light in Eevee?
Two ways that seem to work


Glass Shader with a Mesh light inside


enable Screen Space Refraction (in render tab and material setting)
set refraction depth to a non-zero number (to fake the glass thickness)
I used a musgrave texture to fake uneven light intensity

Translucent BSDF shader, with a Point light inside.


nicely simulates different thickness and light intensity
just keep in mind, that Eevee is limited to 128 lights per scene



Glass button with a Mesh light inside


Translucent button with a  Point light inside